Gday, I have access to skills & equipment to make a Suspension corrected rigid disc 26" fork.
My question relates to whether to construct the rigid fork to match the suspension fork in which range of travel. I would think with the regular rider seated, ie with some susp fork compression. Rather than fully extended or compressed.
Thanks.
Suspension corrected rigid disc 26" fork make DIY
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twowheels
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RonK
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Re: Suspension corrected rigid disc 26" fork make DIY
Normal sag setting is 20% of travel. A 26” MTB would probably have had an 80mm or 100mm fork.
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Duck!
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Re: Suspension corrected rigid disc 26" fork make DIY
My bold: not necessarily, 26" wheel was standard for all disciplines of MTB until not all that long ago - a downhill bike could have upward of 200mm travel.
That out of the way, allowing for sag is not a dumb idea; find out what travel fork the bike was designed for, find the fully-extended axle-crown measurement for said fork (or at least an average, because not all forks of a given travel have the same A-C measurement), then reduce by 20% of the designed travel for rigid.
I had a thought, but it got run over as it crossed my mind.
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
Just to clarify, you recommend doing this by way of calculation, rather than sitting on the bike and having an assistant measure?Duck! wrote: ↑Mon Mar 30, 2020 11:00 pmMy bold: not necessarily, 26" wheel was standard for all disciplines of MTB until not all that long ago - a downhill bike could have upward of 200mm travel.
That out of the way, allowing for sag is not a dumb idea; find out what travel fork the bike was designed for, find the fully-extended axle-crown measurement for said fork (or at least an average, because not all forks of a given travel have the same A-C measurement), then reduce by 20% of the designed travel for rigid.
BTW - if anyone has an existing DXF (or Autodesk Inventor part) file of the disc brake mount, ie to weld onto the fork that would be useful.
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baabaa
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Re: Suspension corrected rigid disc 26" fork make DIY
Send a nice email to this lot telling them your plans to make a one off.
They would have all the specs you need and as they no longer make the 26 version they maybe happy to help ( FWIW I run the 29er version of the same, no expert on all things forks but works for me)
https://salsacycles.com/components/cate ... to_26_disc
I believe the fork was built for and around the ala carte https://salsacycles.com/bikes/archive/ala_carte1
The 26 inch disc and canti models had a differing travel base 100 vs 80mm... I think
They would have all the specs you need and as they no longer make the 26 version they maybe happy to help ( FWIW I run the 29er version of the same, no expert on all things forks but works for me)
https://salsacycles.com/components/cate ... to_26_disc
I believe the fork was built for and around the ala carte https://salsacycles.com/bikes/archive/ala_carte1
The 26 inch disc and canti models had a differing travel base 100 vs 80mm... I think
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Trevtassie
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Re: Suspension corrected rigid disc 26" fork make DIY
Just FYI the old Surly Troll Sus Corrected fork was 453mm Axle to crown, the new non corrected one is 420mm
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RonK
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Re: Suspension corrected rigid disc 26" fork make DIY
If the sag is correctly set the result will be the same. Calculate it.
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bychosis
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Re: Suspension corrected rigid disc 26" fork make DIY
5-10mm is hardly likely to make a big difference either.
bychosis (bahy-koh-sis): A mental disorder of delusions indicating impaired contact with a reality of no bicycles.
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
Thanks everyone. Production starts (today?).
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bychosis
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Re: Suspension corrected rigid disc 26" fork make DIY
Good luck. I wouldn’t trust my skills to do something so closely related to keeping my teeth intact.
Please post some pics. Progress and final would be awesome!
Please post some pics. Progress and final would be awesome!
bychosis (bahy-koh-sis): A mental disorder of delusions indicating impaired contact with a reality of no bicycles.
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baabaa
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
Oxy fusion welded steel. Less clean up than MIG. Fork tubes sleeved internally. Tack welded the two halves together today.
Had done this before I saw the request for photos. Still find posting photos on BNA burdensome. Perhaps something someone locked down could make more user friendly.
Will take home & check it out. Then make up a jig for the disc brake bracket. Possibly draw it on Autodesk Inventor & cut with plasma cutter.
Some professional development is worth attending!
Had done this before I saw the request for photos. Still find posting photos on BNA burdensome. Perhaps something someone locked down could make more user friendly.
Will take home & check it out. Then make up a jig for the disc brake bracket. Possibly draw it on Autodesk Inventor & cut with plasma cutter.
Some professional development is worth attending!
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
Okay, I asked elsewhere, I'll try with one photo first
If it works you'll see the two halves tack welded. Modified Vee Brake bridge and front hub to keep all aligned.
If it works you'll see the two halves tack welded. Modified Vee Brake bridge and front hub to keep all aligned.
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Bunged Knee
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Re: Suspension corrected rigid disc 26" fork make DIY
Pic not working or in private, haven't you used the Preview button to check if it worked or not before you submitted it in post.twowheels wrote: Okay, I asked elsewhere, I'll try with one photo first
If it works you'll see the two halves tack welded. Modified Vee Brake bridge and front hub to keep all aligned.
ID please? What ID? My seat tube ID is 27.2mm or 31.6mm depending on what bikes I ride today.thanks...
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
Close ups of tack welding and brake bridge jig
Measure, template, measure ... 49 mm altered to 50 mm as result of templating process
Locating jig drawm with Autodesk Inventor. This will be sheet metal cut with plasma cutter and bolted between left inner fork & hub. 4 mm (heat insulated) spacer will be placed atop the jig, then the 6 mm mild steel disc brake mount bracket itself.
Measure, template, measure ... 49 mm altered to 50 mm as result of templating process
Locating jig drawm with Autodesk Inventor. This will be sheet metal cut with plasma cutter and bolted between left inner fork & hub. 4 mm (heat insulated) spacer will be placed atop the jig, then the 6 mm mild steel disc brake mount bracket itself.
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
yes I previewed, that is why I went ahead & wasted more of my time.Bunged Knee wrote: ↑Thu Apr 02, 2020 12:38 pmPic not working or in private, haven't you used the Preview button to check if it worked or not before you submitted it in post.twowheels wrote: Okay, I asked elsewhere, I'll try with one photo first
If it works you'll see the two halves tack welded. Modified Vee Brake bridge and front hub to keep all aligned.
I've changed a setting, visible now?
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Bunged Knee
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Re: Suspension corrected rigid disc 26" fork make DIY
You had fixed some of it and I see some pics.twowheels wrote:yes I previewed, that is why I went ahead & wasted more of my time.Bunged Knee wrote: ↑Thu Apr 02, 2020 12:38 pmPic not working or in private, haven't you used the Preview button to check if it worked or not before you submitted it in post.twowheels wrote: Okay, I asked elsewhere, I'll try with one photo first
If it works you'll see the two halves tack welded. Modified Vee Brake bridge and front hub to keep all aligned.
I've changed a setting, visible now?
Google do get problems of uploading pics.
ID please? What ID? My seat tube ID is 27.2mm or 31.6mm depending on what bikes I ride today.thanks...
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twowheels
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Re: Suspension corrected rigid disc 26" fork make DIY
I'll try Imgur
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